Down For That Shit - When you are pretty pumped for something that has been suggested, for something you have been invited to, or any idea in general. Usually done over texting or social networking sites.

Texter 1: Hey bruh, Jasmine is throwing a crazy party, and we were goin to get hammered first, you in?

Density Functional Theory (DFT) is a method of electronic structure calculation in which quantities of interest are approximated by considering only functionals of the electron density, rather than functionals of the many-body electron state.

I estimated the ground-state energy of the molecule using DFT with the local density approximation exchange functional because I didn't give. a. FUCK.